US5229680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric transformer using single crystal of linbo3
Assignee: Fujitsu Ltd
•
Filing: 1991-09-18
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Granted: 1993-07-20
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Expires: 2011-09-18
Abstract
Abstract A piezoelectric transformer includes a substrate of piezoelectric material, preferably a single crystal of LiNbO 3 . The substrate is uniformly polarized in a selected direction thereof and vibrated in a direction of the length thereof. An input voltage is applied across both sides of a portion of the substrate in a direction of the thickness thereof and thus excites a vibration by way of piezoelectric effect. Thereby another voltage is caused in the direction of the thickness of the substrate in a portion other than the portion to which the input voltage is applied, and taken out as an output voltage. As a result, it is possible to decrease the output impedance to obtain a large load current and thus fully heighten a step-up ratio of the piezoelectric transformer.
Inventors
- 👤 Masuji Sato
- 👤 Noboru Wakatsuki
- 👤 Kiyoshi Nakamura
- 👤 Yoshinori Adachi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:36
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/40
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
124 words
A piezoelectric transformer comprising: a substrate of piezoelectric material comprising a rotated Y-cut substrate of a single crystal of lithium niobate uniformly polarized in a Z-axis direction thereof, an angle of rotation in the rotated y-cut substrate being selected to be in the range of approximately 120° to 160°, a portion of the substrate receiving an electrical field in a direction of the thickness thereof and another portion of the substrate having another electrical field produced therein, by way of piezoelectric effect, in the direction of the thickness thereof and thus producing an output voltage; and means for supporting the substrate at at least one portion thereof corresponding to a node of an excited vibration produced therein by the receipt of the electrical field.
Claim 2
Dependent Claim
124 words
A piezoelectric transformer comprising: a substrate of piezoelectric material comprising a rotated Y-cut substrate of a single crystal of lithium niobate uniformly polarized in a Z-axis direction thereof, an angle of rotation in the rotated y-cut substrate being selected to be in the range of approximately 120° to 160°, a portion of the substrate receiving an electrical field in a direction of the thickness thereof and another portion of the substrate having another electrical field produced therein, by way of piezoelectric effect, in the direction of the thickness thereof and thus producing an output voltage; and means for supporting the substrate at at least one portion thereof corresponding to a node of an excited vibration produced therein by the receipt of the electrical field.
Claim 3
Dependent Claim
50 words
A piezoelectric transformer as set forth in claim 1, further comprising a pair of input electrodes affixed on the substrate and by which the electrical field is applied to the substrate, and a pair of output electrodes affixed on the substrate and by which the output voltage is taken out.
Claim 4
Dependent Claim
49 words
A piezoelectric transformer as set forth in claim 2, wherein the pair of input electrodes is formed on respective, opposite main surfaces of a first half portion thereof, and the pair of output electrodes is formed on respective, opposite main surfaces of a second half portion of the substrate.
Claim 5
Dependent Claim
39 words
A piezoelectric transformer as set forth in claim 3, wherein the periphery of at least one electrode, of the pair of input electrodes and the pair of output electrodes, is disposed inwardly from the corresponding periphery of the substrate.
Claim 6
Dependent Claim
26 words
A piezoelectric transformer as set forth in claim 4, wherein the at least one electrode having an inwardly disposed periphery is one of the output electrodes.
Claim 7
Dependent Claim
85 words
A piezoelectric transformer as set forth in claim 3, wherein first regions of the main surfaces of the substrate and of the input and output electrodes formed thereon are defined for providing terminal lead connections to the respective input and output electrodes, and further comprising a protection film formed on second regions of at least one of the main surfaces of the substrate and of the respective input and output electrodes formed thereon, the second regions being other than the first regions of the substrate.
Claim 8
Dependent Claim
85 words
A piezoelectric transformer as set forth in claim 4, wherein first regions of the main surfaces of the substrate and of the input and output electrodes formed thereon are defined for providing terminal lead connections to the respective input and output electrodes, and further comprising a protection film formed on second regions of at least one of the main surfaces of the substrate, and of the respective input and output electrodes formed thereon the second regions being other than the first regions of the substrate.
Claim 9
Dependent Claim
16 words
A piezoelectric transformer as set forth in claim 6, wherein the protection film comprises silicon oxide.
Claim 10
Dependent Claim
16 words
A piezoelectric transformer as set forth in claim 6, wherein the protection film comprises silicon nitride.
Claim 11
Dependent Claim
32 words
A piezoelectric transformer as set forth in claim 1, wherein the angle of rotation, in the rotated Y-cut substrate of a single crystal of lithium niobate, is selected to be approximately 140°.
Claim 12
Dependent Claim
140 words
A piezoelectric transformer comprising: a substrate of piezoelectric material comprising a rotated Y-cut substrate of a single crystal of lithium niobate uniformly polarized in a Z-axis direction thereof and vibrated in a direction of the length thereof, an angle of rotation in the rotated Y-cut substrate being selected to be in the rang of approximately 120° to 160°, a first portion of the substrate receiving a first portion of the substrate receiving an input voltage in a direction of the thickness thereof and thus exciting a vibration, by way of a piezoelectric effect, in a second portion of the substrate, other than the first portion, and produces an output voltage therein in the direction of the thickness thereof; and means for supporting the substrate at at least one portion thereof corresponding to a node of the excited vibration produced therein.
Claim 13
Dependent Claim
140 words
A piezoelectric transformer comprising: a substrate of piezoelectric material comprising a rotated Y-cut substrate of a single crystal of lithium niobate uniformly polarized in a Z-axis direction thereof and vibrated in a direction of the length thereof, an angle of rotation in the rotated Y-cut substrate being selected to be in the rang of approximately 120° to 160°, a first portion of the substrate receiving a first portion of the substrate receiving an input voltage in a direction of the thickness thereof and thus exciting a vibration, by way of a piezoelectric effect, in a second portion of the substrate, other than the first portion, and produces an output voltage therein in the direction of the thickness thereof; and means for supporting the substrate at at least one portion thereof corresponding to a node of the excited vibration produced therein.
Claim 14
Dependent Claim
37 words
A piezoelectric transformer as set forth in claim 11, wherein the vibration exited in the direction of the length of the substrate is a fundamental wave vibration of a longitudinal mode and with a half-wave length resonance.
Claim 15
Dependent Claim
35 words
A piezoelectric transformer as set forth in claim 11, wherein the vibration excited in the direction of the length of the substrate is a vibration of a secondary, longitudinal mode with a one-wave length resonance.
Claim 16
Dependent Claim
82 words
A piezoelectric transformer as set forth in claim 11, further comprising a pair of input electrodes formed in the respective, opposite main surfaces of the first portion of the substrate and to which the input voltage, received by the first portion of the substrate, is applied and a pair of output electrodes formed on respective, opposite main surfaces of the second portion of the substrate and from which the output voltage produced in the second portion of the substrate is taken out.
Claim 17
Dependent Claim
28 words
A piezoelectric transformer as set forth in claim 14, wherein the first and second portions of the substrate comprise, substantially, first and second half portion of the substrate.
Claim 18
Dependent Claim
39 words
A piezoelectric transformer as set forth in claim 13, wherein a periphery of at least one electrode, of the pair of input electrodes and the pair of output electrodes, is disposed inwardly from the corresponding periphery of the substrate.
Claim 19
Dependent Claim
21 words
A piezoelectric transformer as set forth in claim 16, wherein the at least one electrode is one of the output electrodes.
Claim 20
Dependent Claim
84 words
A piezoelectric transformer as set forth in claim 15, wherein first regions of the main surfaces of the substrate and of the input and output electrodes formed thereon are defined for providing terminal lead connections to the respective input and output electrodes, and further comprising a protection film formed on second regions of at least one of the main surfaces of the substrate and of the respective input and output electrodes formed thereon, the second regions being other than first regions of the substrate.
Claim 21
Dependent Claim
84 words
A piezoelectric transformer as set forth in claim 16, wherein first regions of the main surfaces of the substrate and of the input and output electrodes formed thereon are defined for providing terminal lead connections to the respective input and output electrodes, and further comprising a protection film formed on second regions of at least one of the main surfaces of the substrate and of the respective input and output electrodes formed thereon, the second regions being other than first regions of the substrate.
Claim 22
Dependent Claim
16 words
A piezoelectric transformer as set forth in claim 18, wherein the protection film comprises silicon dioxide.
Claim 23
Dependent Claim
16 words
A piezoelectric transformer as set forth in claim 18, wherein the protection film comprises silicon nitride.
Claim 24
Dependent Claim
32 words
A piezoelectric transformer as set forth in claim 11, wherein the angle of rotation, in the rotated Y-cut substrate of a single crystal of lithium niobate, is selected to be approximately 140°.
Claim 25
Dependent Claim
151 words
A piezoelectric transformer unit comprising: a piezoelectric transformer including a substrate of piezoelectric material comprising a rotated Y-cut substrate of a single crystal of lithium niobate uniformly polarized in a Z-axis direction thereof and vibrated in a direction of the length thereof, an angle of rotation in the rotated Y-cut substrate being selected to be in the range of approximately 120° to 160°, a first portion of the substrate receiving an input voltage in a direction of the thickness thereof and thus exciting a vibration, by way of a piezoelectric effect, in a second portion of the substrate, other than the first portion, and producing an output voltage therein in the direction of the thickness thereof; a second substrate; and a supporting member provided on the second substrate and supporting the piezoelectric transformer at a portion thereof corresponding to a node of the excited fundamental wave vibration with half-wave length resonance.
Claim 26
Dependent Claim
151 words
A piezoelectric transformer unit comprising: a piezoelectric transformer including a substrate of piezoelectric material comprising a rotated Y-cut substrate of a single crystal of lithium niobate uniformly polarized in a Z-axis direction thereof and vibrated in a direction of the length thereof, an angle of rotation in the rotated Y-cut substrate being selected to be in the range of approximately 120° to 160°, a first portion of the substrate receiving an input voltage in a direction of the thickness thereof and thus exciting a vibration, by way of a piezoelectric effect, in a second portion of the substrate, other than the first portion, and producing an output voltage therein in the direction of the thickness thereof; a second substrate; and a supporting member provided on the second substrate and supporting the piezoelectric transformer at a portion thereof corresponding to a node of the excited fundamental wave vibration with half-wave length resonance.
Claim 27
Dependent Claim
153 words
A piezoelectric transformer unit comprising: a piezoelectric transformer including a substrate of piezoelectric material comprising a rotate Y-cut substrate of a single crystal of lithium niobate uniformly polarized in a Z-axis direction thereof and vibrated in a direction of the length thereof, an angle of rotation in the rotated Y-cut substrate being selected to be in the range of approximately 120° to 160°, a first portion of the substrate receiving an input voltage in a direction of the thickness thereof and thus exciting a vibration, by way of a piezoelectric effect, in a second potion of the substrate, other than the first portion, and producing an output voltage therein in the direction of thickness thereof; a second substrate; and a pair of supporting members provided on the second substrate and supporting the piezoelectric transformer at two portions thereof respectively corresponding to nodes of the excited vibration of secondary mode with one-wave length resonance.
Claim 28
Dependent Claim
153 words
A piezoelectric transformer unit comprising: a piezoelectric transformer including a substrate of piezoelectric material comprising a rotate Y-cut substrate of a single crystal of lithium niobate uniformly polarized in a Z-axis direction thereof and vibrated in a direction of the length thereof, an angle of rotation in the rotated Y-cut substrate being selected to be in the range of approximately 120° to 160°, a first portion of the substrate receiving an input voltage in a direction of the thickness thereof and thus exciting a vibration, by way of a piezoelectric effect, in a second potion of the substrate, other than the first portion, and producing an output voltage therein in the direction of thickness thereof; a second substrate; and a pair of supporting members provided on the second substrate and supporting the piezoelectric transformer at two portions thereof respectively corresponding to nodes of the excited vibration of secondary mode with one-wave length resonance.
Claim 29
Dependent Claim
16 words
A piezoelectric transformer as set forth in claim 7, wherein the protection film comprises silicon dioxide.
Claim 30
Dependent Claim
16 words
A piezoelectric transformer as set forth in claim 7, wherein the protection film comprises silicon nitride.
Claim 31
Dependent Claim
16 words
A piezoelectric transformer as set forth in claim 19, wherein the protection film comprises silicon dioxide.
Claim 32
Dependent Claim
16 words
A piezoelectric transformer as set forth in claim 19, wherein the protection film comprises silicon nitride.
Claim 33
Dependent Claim
33 words
A piezoelectric transformer as set forth in claim 23, wherein the angle of rotation, in the rotated Y-cut substrate of a single crystal of lithium niobate, is selected to be approximately 140 °.
Claim 34
Dependent Claim
32 words
A piezoelectric transformer as set forth in claim 24, wherein the angle of rotation, in the rotated Y-cut substrate of a single crystal of lithium niobate, is selected to be approximately 140°.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-07-19 | 1997-01-18 | 1997-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-19 | 2001-01-18 | 2001-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-19 | 2005-01-18 | 2005-07-20 | $7700.00 | Window Closed / Lapsed |